/**
 * The MIT License
 *
 * Copyright for portions of unirest-java are held by Kong Inc (c) 2013.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package kong.unirest.core.java;

/** Strategy for appending the boundary across parts. */
enum BoundaryAppender {
    FIRST("--", "\r\n"),
    MIDDLE("\r\n--", "\r\n"),
    LAST("\r\n--", "--\r\n");

    private final String prefix;
    private final String suffix;

    BoundaryAppender(String prefix, String suffix) {
        this.prefix = prefix;
        this.suffix = suffix;
    }

    void append(StringBuilder target, String boundary) {
        target.append(prefix).append(boundary).append(suffix);
    }

    static BoundaryAppender get(int partIndex, int partsSize) {
        return partIndex <= 0 ? FIRST : (partIndex >= partsSize ? LAST : MIDDLE);
    }
}
